Improvement in pumps



UNITED SAMUEL ARNDT AND NVALLAOE S. AYRES, OF EASTON, PENNSYLVANIA.

IMPROVEMENT IN PUMPS.

Speciticalion forming part of Leiters Patent No. 164,631, dated June 22,i875; application tiled May 20, 1373.

To all 'whom fitmay concern Be it knownthat we, SAMUEL ARNDT and WALLAcES. AYREs, both of Easton, in the county of Northampton and State ofPennsylvania, have invented certain Improvements in Pumps, of which thefollowing is a specilication:

Our invention relates to that class of pumps used in giving motion toluids whose valves are closed by the return action of the iiuid drawn orforced through them.

The object of our invention is to prevent the destructive effects ofnon-elastic fluids to the pump by the introduction of air into the iiuidin the most simple, effective, and practicable manner.

To give a more clear and definite idea of our invention, its action, andapplication than could be given in a general way, we will conne thedescription to the feed-water pumps of locomotives.

In the drawing, Figure l represents a sectional view of a feed-waterpump. A is the plunger and pump-barrel; B, the supply-pipe leading fromthe water-tank 5 C and D, the

induction and ejection valves 3 F, the ejectionpipe leading to theboiler; G, the supplychamber. Fig. 2 represents a vertical section 0fthe check-valve, together with a horizontal section of the same througha a, looking upward. This valve is connected with the ejection-pipe ofthe pump by the neck T, is fastened to the boiler by the flange f f, andprevents the water forced into the boiler from returning. E is the valveproper, resting upon its seat r r. c c is the valve-cage, which governsthe lift of the valve, and guides it in its mot-ion. These valves O, D,and E have been a source of annoyance both to engineer and machinist, onaccount of the noise in closing and their constant wear. Thisannoyanee,to gether with the leaking of joints from excessive strains,has, to a certain extent, been prevented by the introduction of air intothe valve-box of the pump. le propose to introduce the air, not into thevalve-box, but into the supplypipe or chamber through the air valve N,which we have termed The Pneumatic,77 and which we claim is of our owninvention. Fig. 3 represents a section and plan of The-Pneumatic. Itcon-- sists of any ordinary tap-plug, as H, drilled through the center,with the inner end rea ed out, forming the valve-seat a n. The valve Kis ground to its seat, and has a stem itting loosely in the plug andlong enough to pass through it, with a slot, S, cut in the stem, longerthan the necessary lift of the valve, to allow for the thickness of thepin I). Through this slot S, and through the plug, is passed the pin l?.This pin prevents the valve being drawn from its place, and adjusts thelift.4 This air-valve N, Fig. l, must always be placed in a verticalposition, openinginward and upward, and always on the receiving side ofthe induction-valve, substantially as shown inthe drawing. Now, when theplunger A draws the Water into the pump-barrel, it also draws in a smallquantity oi' air through the airvalve N. This air, in passing into thesupplyl at this point, meets the stream of water where it is in thegreatest state of agitation, owing to the sudden change oi' directionwhich it here makes, and is at once divided into smaller bubbles. Onpassing the induction-valve of the pump, the bubbles are subdivided intovery minute ones, and are thoroughly mixed with the water, making itquite elastic. An air-chamber has been found to be of service inrelieving the shocks and strains in themachinery ot' the pump, incidentto the non-elasticity of the water, and air introduced into the water atthe valve-box proves to be a better remedy; but, to introduce the air atthe point which we have designated, we are assured accomplishes thedesired end in every way, with these virtues, which we claim, viz

The mechanism used to introduce the air is very simple, and hence notliable to disorder. The amount of air introduced, being divided intovery minute bubbles, and thoroughly mixed with the water, is a minimumin quantity-hence at the least sacrifice of the workin g capacity of thepump.

Byintroducingthe air into the supply on the receiving side of theinduction-valve, the supply-pipe or chamber, together with theinduetion-valve, is relieved from all destructive shocks and strains.

By combining the air-valve with a tap-plug, it can be removed forrepairs at anytime, and a similar or solid plug screwed into its placeuntil repairs are completed, thus allowing the pump to continueWorking.v Also, by combining the air-valve with a tap-plug, andadjusting the lit't by means of the slot S and pin P,

or its equivalent, the valve is shielded from any alteration by externalagencies.

The invention above described can be applied to the feed-Water pumps ofstationary and marine engines; also to any engine, pump,

or machine laboring under difticulties likeV those above mentioned.

Having described our invention, its action,

and application, what We claim therein as newy and of our own invention,and desire to secure by Letters Patent, is-

l. The combination, with the supply-pipe SAMUEL ARNDT.

WALLACE S. AYRES.

Witnesses:

W. H. HILDEBRAND, WM. ABLE.

